Question

Which of the following substance contracts on heating?

a)Lukewarm water b) Ice c) Iron d) Mercury​

Answer 1

c)iron

because iron is expand on heating

Answer 2

Ice contracts on heating.

• There's a common tendency of different substances, that an expansion is observed during the heating of those objects.
• But, there are some exceptions also.
• Ice reduces in volume or contracts, when it gets heated.
• This happens because, in the ice crystal formation there are hydrogen bonds which are arranged in hexagonal shape. This takes more space. But, when we melt the ice these hexagonal structures are broken and the water molecules come close to each other again. That's why, ice contracts on heating.
• The rest of the substances expands during the heating process.
• When ice is heated, it converts to water and expands at a temperature of 0° C, and then when it is heated further between 0°C and 4°C, instead of expanding it begins to contract.
• This phenomenon is known as anomalous expansion of water.
• All the other options only expand on heating due to the increase in kinetic energy of the molecules.
• Hence the correct option is ice.

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